Here are some synonyms for "vaunt":
* brag
* show off
* swagger
* blow one's own horn
* self-promote
Here are some examples of how "vaunt" is used in a sentence:
* "He would vaunt his wealth and influence at every opportunity."
* "The company's website vaunts its commitment to customer service."
* "The general's victory was so decisive that he could not help but vaunt it to his troops."